PDF malware analysis — malicious · 8b851b83b06fc974

MALICIOUS

PDF

40.5 KB Created: 2020-08-24 22:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 3681a4eaf892db68b1840048640d688d SHA-1: d07455555786e88a06023dfce6b45377501c2d0a SHA-256: 8b851b83b06fc9741d0656a7f88942d8213e38910c08c4d3994e6a3bd92cf05f

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link directs to a known malicious redirector. This suggests a link farm strategy to obscure the ultimate malicious destination. The document body, though partially corrupted, contains keywords related to educational material, likely a lure to encourage clicks on the malicious links. No scripts were extracted, and the primary malicious activity is the redirection via the embedded URL.

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=tnpsc+aptitude+questions+answers+in+tamil+pdf
- http://files.mreasthamclass.com/uploads/1/3/1/8/131871864/14c320f14.pdf
- http://jotofopal.healdsburgflowers.com/uploads/1/3/2/3/132303307/ccfaf14e.pdf
- https://cdn.shopify.com/s/files/1/0430/8375/9765/files/tony_hawk_pro_skater_2_rom.pdf
- https://cdn.shopify.com/s/files/1/0432/1712/5536/files/california_dmv_test_questions_and_answers.pdf
- https://cdn.shopify.com/s/files/1/0466/2309/6997/files/sawofibajokatigemize.pdf
- https://cdn.shopify.com/s/files/1/0434/0095/4021/files/mepezukelogududelox.pdf
- https://cdn.shopify.com/s/files/1/0434/5813/4168/files/81716249016.pdf
- https://cdn.shopify.com/s/files/1/0462/1929/6922/files/dajokowinulodexe.pdf
- https://cdn.shopify.com/s/files/1/0430/4361/8965/files/abstract_nouns_examples.pdf
- https://cdn.shopify.com/s/files/1/0431/7410/1149/files/xekuradalubor.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00005f1c.bin` `3e86b7bb7373a241dfd8d9be6ee93e346385d8e4c65853896331ce49bc8d32c9`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5F1C	5468 bytes
`font_01_sfnt_off000071a5.bin` `5568c4e928eb46c6f039b7701f42f5611fa08b4dd4bb10b75fca6e3416992b9b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x71A5	10540 bytes

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