Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1dc55e415f04fde…

MALICIOUS

PDF

47.7 KB Created: 2020-09-02 08:40:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb581368b63adbbbb3f8a5cbff5cb335 SHA-1: 48341731aa3cc3f327b9020f39e8e5a580790d09 SHA-256: e1dc55e415f04fde27dc6157ade797aa30f73f39a940572d5f3e325639833a34
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. This redirector, 'ttraff.club', is likely used to funnel users to malicious content. The document body, though heavily obfuscated, contains the same malicious URL, reinforcing its role in a potential phishing or malware distribution scheme. The ML classifier also strongly indicated maliciousness.

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.club/pify?keyword=curso+de+ingl%25C3%25A9s+avanzado+pdf
    • https://static.usrfiles.com/ugd/bc84a3_9580866dd5e7407dba28c33483b113ee.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c0e9fdcae2349c7a7723f529029c282.pdf
    • https://static.usrfiles.com/ugd/b8c837_84efde7250314dec8f068c642ff89482.pdf
    • https://static.usrfiles.com/ugd/b6edda_39415a7770334fb69c41306bf70db8cc.pdf
    • https://cdn.shopify.com/s/files/1/0431/7331/4715/files/jovumetaxipux.pdf
    • https://cdn.shopify.com/s/files/1/0434/6308/2146/files/ultimate_guide_to_the_math_act_secon.pdf
    • https://cdn.shopify.com/s/files/1/0459/2258/2679/files/85707536950.pdf
    • https://cdn.shopify.com/s/files/1/0438/7582/7867/files/satellite_weather_report_mp.pdf
    • https://cdn.shopify.com/s/files/1/0437/2119/5669/files/fifa_pack_opener.pdf
    • https://static.usrfiles.com/ugd/a107db_921206f5186d4286a2fc309f26a50aef.pdf
    • https://static.usrfiles.com/ugd/99afdc_3201d68237c743cb90481f154ecca0ad.pdf
    • https://static.usrfiles.com/ugd/3be3a7_9bbc2a439107488986c81c91a6ce10cf.pdf
    • https://static.usrfiles.com/ugd/b8c837_07afa77f3e634e66b134aafe6a3cc6c7.pdf
    • https://cdn.shopify.com/s/files/1/0466/3033/8725/files/14535067176.pdf
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/bejamujaxotuwoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/1015/4908/files/hp_omen_870_review.pdf
    • https://cdn.shopify.com/s/files/1/0436/9963/4328/files/houghton_mifflin_math_algebra_2_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a40.bin
0beda8a259f3059138dabab2e7ce190439484c908ff970c2fbb377f733f89849		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A40 5284 bytes
font_01_sfnt_off00007c10.bin
2eb2c4b0591e0dbe6aa5741064d814bc42a0adcc9ae105cb1a02ab966165ba31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C10 11448 bytes
font_02_sfnt_off0000a14f.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA14F 4324 bytes

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