Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5dbd453a2f20025…

MALICIOUS

PDF

44.5 KB Created: 2020-08-21 05:59:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26715c23ce12c5dac6c715d06fdf1cd2 SHA-1: a2556d61fae4868f4496f5aefe559ccdb0bc96d2 SHA-256: c5dbd453a2f200254d7c592fac70a9a449d173bde86de7664c33467724e152ee
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=lagu+baby+take+my+hand+stafaband'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL and other Shopify links, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=lagu+baby+take+my+hand+stafaband
    • http://files.innerdolphinawakening.com/uploads/1/3/1/6/131606035/kumuvefajolen.pdf
    • http://dikepus.nathanaelgreenemonumentfoundation.org/uploads/1/3/0/9/130969465/9757919.pdf
    • http://pimag.popcob.org/uploads/1/3/1/1/131164250/9238655.pdf
    • http://files.ipsproptech.com/uploads/1/3/1/6/131637640/lebusodufe_gifukapalivima.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0514/files/1603741528.pdf
    • https://cdn.shopify.com/s/files/1/0430/8588/9689/files/41077741913.pdf
    • https://cdn.shopify.com/s/files/1/0437/0720/3739/files/spanish-_english_dictionary_premium_apk.pdf
    • https://cdn.shopify.com/s/files/1/0440/4156/8421/files/nirunibogidubit.pdf
    • https://cdn.shopify.com/s/files/1/0440/7053/5318/files/brother_mfc-_l2700dw_driver.pdf
    • https://cdn.shopify.com/s/files/1/0432/0277/3156/files/building_construction_illustrated_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0436/4078/3008/files/saxajig.pdf
    • https://cdn.shopify.com/s/files/1/0437/0235/4070/files/vavajuzurikobajuvajigabat.pdf
    • https://cdn.shopify.com/s/files/1/0432/5670/9273/files/72666871880.pdf
    • https://cdn.shopify.com/s/files/1/0431/6649/8965/files/30147591401.pdf
    • https://cdn.shopify.com/s/files/1/0429/5458/8316/files/pdoto_ballad_of_a_soldier.pdf
    • https://cdn.shopify.com/s/files/1/0433/7867/1779/files/xusunoluwutiwiri.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004db0.bin
4c44fa46296311222a9611f2f72ea3f2246520d7a3e12f3cd2f46c4054a4fbe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4DB0 3600 bytes
font_01_sfnt_off00005aae.bin
628410371bb9ce076f7b7a0d0dcfced0f87af005e71b9613aceca1bba5233e79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AAE 5440 bytes
font_02_sfnt_off00006cdb.bin
d830524a08b45400cdda3ccce7a51876f4b1214257042f9d635777c44924126f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDB 2800 bytes
font_03_sfnt_off0000778a.bin
1474aa20843d27e5bbbc6dfc983bdc04a60cc69bf06a2924edcacf3602024599		 pdf-font-stream PDF embedded font (sfnt) at offset 0x778A 14528 bytes

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